Highly efficient twisted nematic liquid crystal polarization gratings achieved by microrubbing

作者：Honma M^*; Nose T

来源：Applied Physics Letters, 2012, 101(4): 041107.

DOI：10.1063/1.4737945

We demonstrate twisted nematic liquid crystal (LC) polarization gratings (TNPGs) with a high first-order diffraction efficiency (>90%) that have the twist angle as constant, whereas the azimuthal angle of the mid-plane liquid-crystal director varies linearly in space. The high diffraction-efficiency design scheme is derived by means of the Jones matrix method. The designed first-order diffraction efficiency theoretically reaches 100% for the thick LC layer in which the retardation equals (n+1/2)lambda (n is an integer and lambda is the wavelength). We also present a simple model for the grating period-and twist angle-dependent threshold voltage of the Freedericksz transition in TNPGs.

• 出版日期2012-7-23